3d image of tetrahydrofolic acid skeletal formula

tetrahydrofolic acid thfa tetrahydrofolate folic derivative dihydrofolate reductase dihydropteroate synthetase paba precursor bacterial synthesis dihydropteroate megaloblastic anemia metabolite metabolism biosynthesis cycle mechanism pathway path catabolism biosynthetic intermediate biogenesis substrate bioprecursor metabolic enzyme endogenous substance matter material compound component agent reagent reaction production building block molecule molecular formula skeletal structural structure 3d